Abstract
In the industry, induction hardening of rotationally symmetrical workpieces by a single-shot process is a widespread method. Due to only partial superimposition of the workpiece areas to be heated by the coil, high power densities are often needed there. These lead to local hot spots, amounting to an intensive material stress and often result in a short lifetime of the inductor. In this paper, some numerically investigated models will be presented, revealing approaches, how to reduce mechanical stress in the single-shot coil and thus, enabling an increase of service life.
Highlights
Induction hardening of rotationally symmetrical workpieces is usually carried out step by step with a ring coil in a scanning process or at once by a single-shot coil
As there is a graphical correlation between lifetime and stress amplitude by Wöhler curves, some approaches for changing the design with the aim to reduce the maximum load and to increase coil lifetime are presented in this paper
In order to establish a relationship between the determined equivalent stress and the lifetime of the coil, the available Wöhler curve from the data sheet of the applied copper (CU-HCP) is used, displaying the fatigue strength for the range of 105 - 108 cycles [2]
Summary
Induction hardening of rotationally symmetrical workpieces is usually carried out step by step with a ring coil in a scanning process or at once by a single-shot coil. Some numerically investigated models will be presented, revealing approaches, how to reduce mechanical stress in the single-shot coil and enabling an increase of service life. High power densities are required in the inductor which lead to an inhomogeneous heat source distribution due to electromagnetic effects.
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